POLYMER
·
2024
·
IF 4.1
Quan Yuan,Liwei Yan,Jinfeng Tian,Weiyi Ding,Zhengguang Heng,Mei Liang,Yang Chen,Huawei Zou
Silicon/phenolic hybrid resins are one of the most commonly used materials for thermal protection. However, the weak ability of SiO 2 generated by silicone during ablation to resist the impact of high-speed hot gas flow hinders further improvement of the performance. Therefore, in this work, the ultrahigh-temperature ceramic elements Zr 4+ and Hf 4+ were integrated into hyperbranched polysiloxanes in the form of coordination bond and then introduced into phenolic resin (PR), obtaining hybrid resin with excellent ablative resistance. During ablation, Zr 4+ and Hf 4+ will first undergo ceramization, producing ZrO 2 and HfO 2 . Subsequently, they will undergo a solid solution sintering reaction to produce complex-phase ceramic particles (Zr x Hf 1-x )O 2 , which are embedded in the SiO 2 liquid film and provide excellent pinning effect. This gives the hybrid resin excellent ablation resistance, whose linear ablation rate can be as low as 0.038 mm/s, a 58 % decrease compared to pure PR. This work not only provides a new pathway for ceramization through metal ion coordination bonding, but also provides a new way to prepare high-performance TPS materials.
研究领域:
材料科学
·
化学工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE EUROPEAN CERAMIC SOCIETY
·
2024
·
IF 5.8
Wenyan Huang,Yinong Zheng,Qianwen Tao,Yeqi Zhu,Siqi Lan,Ying Yu,Shengjian Mao,Zhichao Xue,Rongqian Yao
High flight speed of hypersonic vehicles will push thermal insulation composites to achieve balanced enhancement of high porosity with increasing load-bearing capability. Herein, hierarchically porous SiC(rGO) polymer-derived ceramics (PDCs) with lightweight, heat-insulating, anti-ablative and tough engineered merits, are designed from polycarbosilane-vinyltriethoxysilane-graphene oxide precursors by re-pyrolysis/graphite-assisted decarburization . Graphite pore-forming agents tightly coupled with SiO x C y /C free (rGO) by C-dangling bonds, can inhibit SiO x C y decomposition, increase ceramic network disorder and expedite concurrent removal of C free . SiO 2 generated from Si-dangling oxidation bonding, efficiently densifies framework to retain mechanical performances, and meanwhile creates more interfaces to enhance phonon scattering. Such structure similar to nodular cast iron confers low thermal conductivity (0.11 W·m -1 ·K -1 ), particularly, fully preserves good compressive strength (5.4 MPa) for SiC(rGO) 40% . Under both cyclic butane flame ablation (∼1300 °C) and long-term oxidation for 7200 s, self-healing effect of SiO 2 imbues products with good structural integrity, shedding light on the opportunity to apply any thermal protection system.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
DOI
高影响因子
Advanced Fiber Materials
·
2025
·
IF 21.3
Dong Xiang,Ma Yan,Zhang Shidai,Rong Caiyu,Jiang Xiaoyu,Li Yan,Nie Shibin,Tian Konghu
Smart firefighting clothing is in urgent need of rigorous fire resistance. Here, a novel 2D nanomaterial, silver nanoparticle@polydopamine@M(OH)(OCH 3 ) (M=Co, Ni) (AgNP@PDA@M(OH)(OCH 3 )), was utilized to construct self-assembled nano-coated aramid fiber (NCANF). Through phase interface catalysis and high-temperature reduction, NCANF forms a distinctive “metal–carbon–air” honeycomb-like buffer that enables NCANF to withstand the butane flame (1300 °C) for at least 60 s, exceeding the performance of firefighting uniform (FU, Nomex) in service. In this process, the back temperature of NCANF decreased by more than 50% compared to FU, with a maximum difference of 236.1 °C. NCANF offers a rapid fire alarm response under 3 s with a maximum resistance change rate of 15%, and supports the graded indication using arithmetic amplifier circuit. NCANF maintained a maximum resistance change rate of approximately 63% during 50 repeated bends of the manipulator joint. Leveraging the relationship between the joint bending angle and resistance change rate, an “attitude code” system can be established as the initial parameter matrix of a neural network and can enable the recognition of the firefighters’ body language. NCANF well solves the problem of current smart firefighting clothing that lacks rigorous fireproofing and is promising to establish a linked rescue mode based on real-time on-site information collection. Graphical
研究领域:
材料科学
·
消防工程
·
智能可穿戴设备
·
传感技术
✓ 已验证
产品关联
DOI
高影响因子
REACTIVE & FUNCTIONAL POLYMERS
·
2024
·
IF 4.5
Ting Pan,Hao Wu,Zhiqiang Guan,Xiaofei Zhu,Yingqian Hu,Linxuan Fang,Yongbing Pei,Lianbin Wu
Octaglycidyldimethylsilyl polyhydric silsesquioxane (OG-POSS) in coordination with tetraethyl orthosilicate, tetrapropyl orthosilicate and tetrabutyl orthosilicate mixed solution was applied to the bonding of metal substrate and silicone resin thermal protective coating. The influence of OG-POSS addition on the interface of primer was systematically investigated by means of scanning electron microscope (SEM), salt spray test, thermogravimetric infrared spectroscopy (TGA-IR) and back temperature test. Results showed that the addition of OG-POSS favored the formation of a silane film of the primer, resulting in a more compact and continuous film. At the same time, the silane film had excellent corrosion resistance and adhesion, with a maximum adhesion strength of about 1.42 MPa. In addition, OG-POSS provided a unique Si-O-Si cage structure in the primer, which improved the ablation resistance of the interface layer, preventing the degradation and peeling of the coating in harsh environments.
研究领域:
材料科学
·
表面工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF ALLOYS AND COMPOUNDS
·
2024
·
IF 5.8
Siqi Lan,Zhenguo Huang,Wenyan Huang,Yeqi Zhu,Jiahua Zhan,Shengjian Mao,Zhichao Xue,Rongqian Yao
Demand for SiC-based polymer-derived ceramics (PDCs) employed as hypersonic vehicle components with light weight, high strength, excellent high-temperature/ablation resistance is increasingly urgent. Herein, bulk SiC(Hf, rGO) nanocomposite PDCs were fabricated via re-pyrolyzing ball-milling blends of unique SiC(Hf, rGO) p /polyhafniumcarbosilane-vinyltriethoxysilane-graphene oxide (PHVG). Highly cross-linked PHVG can effectively optimize compact formability and improve ceramic yield. In-situ formed HfO 2 embedded in ceramic network toughens microstructure, while interfacial HfOSi increases structure disorder to improve high-temperature properties. As demonstrated, SiC(Hf, rGO) modified by 3 wt.% Hf and re-pyrolyzed at 1300 °C possess good mechanical performances including hardness (5.83 GPa), fracture toughness (4.29 MPa·m 1/2 ), compressive strength (181.83 MPa) and flexural strength (46.55 MPa). More interestingly, self-healing HfO 2 (HfSiO 4 )/SiO 2 protective layer emerging during 20 min surface ablation test at 1300 °C, timely covers defects and avoids destructive structure, thus retains stable structure and mechanical properties of specimens. Such nanocomposites can promote uses in thermal protection systems (TPS) for hypersonic vehicles against extreme high-temperature environments.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
Advanced Fiber Materials
·
2025
·
IF 21.3
Gao Yuan,Yu Pi-Hang,Zhang Jun,Zhang Guo-Dong,Guo Chuan-Hui,Zhou Yi-Qian,Long Yun-Ze,Wu Hui
Lead-free barium titanate (BaTiO 3 ) nanofiber material is an attractive functional material. However, as a ceramic material, its inherent brittleness significantly limits its widespread application. Herein, we optimized the solution blow spinning process using aerodynamic simulations, enabling the efficient fabrication of layered barium titanate/aluminum oxide (BaTiO 3 /Al 2 O 3 ) ceramic nanofiber aerogels. The incorporation of amorphous Al 2 O 3 repaired the defects in the nanofibers, providing aerogels with outstanding mechanical properties. For example, these aerogels can support nearly 1000 times their own weight, exhibit a tensile strain of 11%, and demonstrate exceptional compressive resilience and fatigue resistance. Additionally, the aerogels demonstrated superior performance in flexible electronics, thermal protection, sound absorption, and high-temperature filtration. This research paves the way for the large-scale production and extensive application of flexible piezoelectric ceramic aerogels. Graphical abstract
研究领域:
材料科学
·
纳米技术
·
功能材料
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES PART A-APPLIED SCIENCE AND MANUFACTURING
·
2022
·
IF 9.463
Hebing Wang,Xiandong Quan,Lianhua Yin,Xiangyu Jin,Yiwu Pan,Can Wu,He Huang,Changqing Hong,Xinghong Zhang
This paper reports a lightweight thermal protection composite with good anti-ablation and thermal insulation properties for service in high temperature environment. The needle quartz fiber (NQF) reinforced phenolic resin aerogel (PRA) composites with surface densification and graded structure were prepared using a mixture of ceramic resin (CR) as the surface layer and phenolic resin (PR) as the internal layer. The Tensile and bending strength of the dense layers were up to 39.22 MPa and 57.22 MPa, respectively. The complete volume rebounded compressive strength of the internal layer was 0.25 MPa and 2.94 MPa in Z and XY directions. In the ablation experiment, the backside temperature peaked at 52 °C within 3 min and 127 °C within 5 min whereas the surface temperature exceeded 1100 °C. Furthermore, the ablated surface remained flat and had a near ablation rate even at a temperature exceeding 1700 °C. The composites which combine insulation and anti-ablation exhibit a prospect in the fields of aerospace and retardant insulation.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CORROSION SCIENCE
·
2025
·
IF 8.5
Huan Guo,Bingzhu Wang,Ruifeng Li,Cheng Su,Jixiang Dai,Yong She,Yongzhong Zhao,Jianjun Sha
Aiming at forming a stable ablation layer for hafnium-based ultrahigh-temperature ceramics under ablation environment, in this work, the Ta-based ceramic was introduced into the Hf-based ceramic, and the effect of Hf/Ta molar ratios on the ablation response behavior and mechanism of (Hf, Ta)B 2 -(Hf, Ta)C-SiC ceramics was investigated. It was found that the introduction of Ta could form a continuous and dense ablation layer. When Hf/Ta= 0.9:0.1, the ceramic composite presented excellent ablation resistance, and the linear ablation rate was −0.083 μm/s, which was only 5.85 % of that of Hf-based ceramics (HfB 2 -HfC-SiC). The excellent ablation resistance attributed to that the ablation products (Ta 2 O 5 and Hf 6 Ta 2 O 17 ) could strongly bonded to the substrate, which was conducive to enhance the stability of the ablation layer.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
CHEMICAL ENGINEERING JOURNAL
·
2024
·
IF 13.3
Zhilin Chen,Jia Chen,Xianbo Hou,Liming Chen
The development of flexible and foldable aerogels for thermal protection in harsh environments has been a long-term challenge as high porosity and weak interface connection can result in typical brittleness. Herein, a remarkable polymerization-regulated strategy was proposed to prepare polyimide (PI) aerogel films with high flexibility and efficient thermal insulation in extreme temperatures by using a facile phase-separation (PS-PI films) method. The polymerization degree of monomers was innovatively used to regulate the flexibility and mechanical properties of PS-PI films by slightly regulating the proportion of monomers. The results showed that the PI aerogel film realized the transition from brittleness to high flexibility, and the tensile strength and fracture strain of PS-PI films were increased by 3 times (11.7 MPa) and 4 times (18.7 %), respectively. Besides, a finite element model was established to analyze the tensile deformation process, revealing the destruction mechanism of aerogel film. The prepared PS-PI film also exhibited robust mechanical properties and efficient thermal insulation properties at extreme temperatures (−130 to 300 °C). The developed PS-PI film possessed high flexibility and efficient thermal-insulated performance at extreme temperatures, which could be a potential candidate for thermal protection in aerospace, energy, and buildings.
研究领域:
材料科学
·
航空航天工程
·
热能工程
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF THE AMERICAN CERAMIC SOCIETY
·
2022
·Vol. 106
·期 2
·1413-1423
·
IF 4.186
Yameng Zhu,Jinpeng Zhu,Hailong Wang,Kaijun Yang,Mingliang Li,Jilin He
Thermal protection materials with high optical reflectivity, low thermal conductivity, and good high-temperature stability are required for the development of laser technologies and the protection of the critical equipment components. Herein, we synthesize a novel thermal protective material, La 0.9 Sr 0.1 Ti 1− x Nb x O 3+ δ (LSTN; x = 0.1, 0.125, 0.15), with different Nb 5+ -ion contents using solid-state sintering. Phase structure analysis demonstrates that LSTN ( x = 0.1, 0.125, 0.15) presents a single-phase monoclinic structure with a uniform element distribution. In particular, the LSTN 0.125 ceramic exhibits ultrahigh optical reflectivity (96%, 2300 nm) and excellent thermophysical properties, such as a high thermal expansion coefficient (10.3 × 10 −6 K −1 , 1000°C), an ultralow thermal conductivity (0.408 W (m K) −1 , 300°C), and excellent high-temperature stability. Aberration-corrected scanning transmission electron microscopy reveals that the disordered substitution of Nb 5+ ions induces numerous lattice distortions and mass fluctuations, which decrease the thermal conductivity, and makes difference in the relative refractive indices of atomic layers causing the high reflectivity of the material. These remarkable properties render the LSTN 0.125 ceramic as an ideal alternative for near-infrared thermal protection applications.
研究领域:
材料科学
·
物理学
✓ 已验证
产品关联
DOI
高影响因子
INDUSTRIAL & ENGINEERING CHEMISTRY RESEARCH
·
2023
·
IF 4.2
Yuan Wang,Yuanbo Cai,Youquan Ling,Haoruo Zhang,Jinfeng Tian,Zhengguang Heng,Shengtai Zhou,Shuang Xia,Mei Liang,Huawei Zou
Flexible thermal protection materials with excellent mechanical and ablative properties were one of the key components in promoting the development of a new generation of aircraft. In the present work, a robust, strongly adhesive, and ablation-resistant PDMS coating was prepared through the covalent connection between PDMS and vinyl-functionalized epoxy resin (EAP) by hydrosilylation. The EAP synthesized by molecular design was uniformly dispersed in the PDMS matrix as an island phase-separation structure. The tensile strength, elongation at break, and shear strength of EAP-modified PDMS (EAP@PDMS) were significantly increased by 575%, 155%, and 183%, respectively, when compared with pure PDMS. Besides, the linear ablation rate (LAR) of EAP@PDMS was greatly declined, which was 80.1% lower than that of pure PDMS, exhibiting excellent ablation resistance. This work opened an avenue toward developing flexible thermal protection coatings with excellent mechanical and ablative properties for aerospace applications.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
COMPOSITES COMMUNICATIONS
·
2024
·
IF 6.5
Rufei Ge,Jie Zhang,Ning Yang,Zihao Fan,Rongying Yin,Haiming Cheng,Changqing Hong,Xinghong Zhang
Lightweight ablative material has served the critical role of protecting space vehicles upon hypersonic entry. However, low oxidation resistance hinders its long-time high-efficiency service in a high-temperature oxidizing atmosphere. Herein, we prepared a lightweight ternary interpenetrating network of three-dimensional carbon fabric, siloxane aerogel , and phenolic aerogel , which are structurally interpenetrating in macro-, micron-to nanoscale and chemically crosslinking at the molecular scale , resulting in a unique combination of low-density (∼0.3 g/cm 3 ), good thermal stability and oxidation resistance , outstanding mechanical properties, and ultralow thermal conductivity . More intriguingly, long-time thermal protection performance (zero surface recession and temperature below 60 °C at 38 mm in-depth after being exposed to 1300 °C for 20 min). The findings of this work provide not only a great potential candidate material for long-time thermal protection in aviation and aerospace applications but also a simple but efficient approach to fabricating multifunctional binary, ternary, and even multiple interpenetrating networks.
研究领域:
材料科学
·
航空航天工程
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）